Roof disappearing when I split it.

[CheezyArki]

I watched some videos on YouTube on how to make 3D roof tiles. But when I tried to split my roof, it suddenly disappeared. 

[Zendrix]

Hi ling.

Its set to infinite! 

[BrunoH]

Hi CheezyArki,

It looks like there's an horizontal 3D cutting plane,

Is the 3D cutting on ? if so turn it off.